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Latin word oro comes from Proto-Indo-European *h₃est-, Proto-Indo-European *h₃éh₁os (Mouth.)
*h₃est- (Proto-Indo-European)
*h₃éh₁os (Proto-Indo-European)
Mouth.
*ōs (Proto-Italic)
or- (Latin)
oro (Latin)
I orate, deliver a speech. I plead, beg. I pray, entreat.